Fuel injection valve



July 8, 1952 H. G. CAMNER FUEL INJECTION vALvE Filed sept. 15, 1948 1&1

IN VEN TOR. HILDING GUNNAR CAMNER ATTORNEY Patented July 8, 1952 ,signor-toAktieblaget Atlasf-Di'esel,fSickla,V near a corpcrationpfifsweden Y vvStockhelm,flSWeirlem appiieationsepiember 15, iseaseriamo, .49,256 Y in Sweden September/2231947 The'presentinvention relates to fuelijecti'on valves comprising a Valve housing Vassembly and iavalve member'movabl'e therein with atgleastjon'e Vlarge Aand oneA small'p'lunger typeportion sealed ca'ndggu'ided in thehousing `assemblyand an auX- `nia-ry vvalve at the vside, of saidmemb'er. One objject of theinventionis to 'produce a'fuelinjection valve v'of 'this type having "a 'reduced diameterso that 'the iuel injection valve may bedisposed in a'narrovv's'pace `in an engine.` Afurthero'bjject 'of the invention is 'to 'produce' a fuel 'injection -valve-'of this'type in-w`hich theportion directly exposed-to' the combustion heat maybe' exchanged.

Aiurtherfeature consists `in the provision Iin a andfsealed fin'the remaining part ofthe valve housingassembly. itis thuspossibl'e to carry out saidstip from special material and to interchange it without interchanging .the valve member or the remaining part of the valve housing assembly ewhich are `-usuallylapped together.

On the accompanying drawing one embodiment of a fuel injection valve according Zto the invention is illustrated in section by Way of example.

ATheifuel injection valve according to `the -iigure ,'ccin`1pris'e-sia valve vhousing vassembly formed '.by threeseparate parts I, 2a 'and '2li held together bya-nut 3 and vassembled as a unit into a wall II of a combustion A`chamber, 'for linstance in the cylinder head of a diesel engine. A Valve member 5 .is .movable in thevalve housing assembly in conventional manner under the action of the fuel pressure, said valve member comprising a thin portion 5a, 5b and a plunger type larger portion 6 which is guided and sealed in an enlarged bore I5 in the valve housing assembly. The thin portion 5a, 5by consists of a thin plunger type portion 5a guided and sealed in a smaller bore I6 in the part 2a of the valve housing assembly and a still thinner stem 5bv extending freely into the tip 2b of the Valve housing assembly and forming the means which definitely shuts off a fuel passage I2, I3 to the nozzle openings I1 in vsoiaims. (onzas-imm :the Valve housing assenibly andswhich ifor this purpose cooperate lwith a valve seat I8 formed close *to the nozzle openings -I1 -in theztipfzb. :The valve member fia, 5b, A6 is actuated` iniconventional manner by a Vpressure spr-lng f 1 :acting "to vclose the-valve member against the l.fuel vf'pres- Asure in `the passage through the -lvalve housing assembly and a chamber I4 surrounding :the fjunctien EbetWeen'the :smallfand Qthe'large plunger VVportions Bearand 6. An'fauxiliaryfvalve iis :provided in the f part 2a of lthe Valve Y housing :assem- 'bly in a portion-of the fuelpassage'.I2fo1iming'fa borefilat the side of-Ithesmall plunger'ftypeiporftionf'a ofthe :val-ve "member 15a; i511, S6. "'Thefauxiliary Ivalve 8 is r1a ycheck valveiwhich, asfiillustrated, fmay'be 'provided =withfa ipressurezreduc'- .ing portion- I0, andwhichkmay cooperate' With'ra stopper II vfor limitinglthe valvexmotion. -Apin lI9 is provided in the part .'2-a :and feXt'ends linto :a :suitable vborein :the vpart i211 foi :the valve hous- `:ing assembly so that Vsaidlparlfscan :only-befas- 4sembled Linl correct lposition relativeto :each :other :with thefface 2U of .the part hrahutting `the yend :of part 2a.

The ".fuel injection valve above described and fillustrated in thedrawing shouldonly yabe' Acnnvsidered as an example iand 'the details of "the vrin-v hvention-may bexmodied in several diierentways iwithin'thefscope'of theclaims. v

'WhatI claim is: Y

:1. .A fuel 'injection valveicomprising ea'ralue housing a portion of which forms a iuelinetion nozzle, a -iuel :injection opening :insaid znozzle, a t-uel lsupply :passage :in said :housing :leadingfitn ssa-id opening, atleast one bore with largevdiam'eter and lone vbore with .small diameter located' 'in ,a unitaryportion of said housing, 'a' unitaryimain valve inem-ber :movable `inthe "housingfand 'having a plungertype guiding portion 'with largelcdiam- :eter forming a vfluid ktightsealln said large lbore, ia-plunger type guiding portion with small. "-.eterfiorming a 'fluid tight 'seal inv A-said small bore and a stem extending from said Asmall di'am'eter portieri for Lcontrolling -said'openina :andf-anaux- @ili'ary #valve inthe housing disposed 2in said pas'- sage at one side of said plunger type guiding portion with small diameter.

2. A fuel injection valve as defined in claim 1, in which said auxiliary valve is a non-return valve opening towards the nozzle opening and in which a chamber is provided in the housing at the iunction of the large and small diameter bores, which chamber communicates directly with the fuel supply passage on the side of the auxiliary valve remote from the injection opening.

cated and said auxiliary valve is disposed in said 'unitary portion.

4. A fuel injection valve comprising a valve housing,` a portion of which forms a fuel injection nozzle, a fuel injection opening in said nozzle portion, a fuel passage leading through said valve housing to said opening, a main valve member in the valve housing movable from closed to open position under the action of fuel pressure in said y passage and provided with at leastone plunger type portion with large diameter and one plungerl type portion with smaller diameter and a stem forming shut off means for controlling the pas-` sage to the nozzle opening, one .bore With' large diameter and one .bore With smaller diameter in the housing, in which bores said plunger type portions form fluid tight seals, and a non-return auxiliary valve in the passage disposed in the housing at one side oi said small bore closely adjacent to said bore and utilizing the space in a portion of the housing laterally of the small bore andl enabling said portion and the portion of the housing laterally of the large bore to be carried out With minimum diameter. v

5. A fuel injection valve comprising a valve housing, a first portion of said housing provided With oneborel with large diameter and one bore with' smaller diameter, a second portion of the housing separate from said rst portion and forming a fuel injection nozzle, a fuel injection opening in said nozzle portion, a fuel passage leading through said valve housing to said opening, a main valve member in the valve housing movable from closed to open position under the action of fuel pressure in said passage andV provided Withat least one plunger type portion' with large diameter forming a fluid tight seal in said large bore and one plunger type portion with smaller diameter forming a fluid tight sealin said small bore and a stem forming shut' ofi" means for controlling the passage to the nozzle -openin'g'and a non-return auxiliary valve in the passage assembled into-the first portion of the housing 'from an end face abutting the second portion and disposed at one side of the small bore in said portion closely adjacent to'said bore i't'o Vutilize the space in the housing laterally'of the smallbor'e. z f

6. A fuel injection valve' comprising aY valve housing,` a rst portion of said `housing provided with one bore with large 'diameter extending from g one end of said portion into th'ehousing and with ione bore with smaller Vdiameter extending from th'eopposite end of said portion into the housing coaxially with' said largeborea second portion of the housing formed as apiece separate from -said first portion and rhaving a face abutting the -end vof `said rst portion into which said small boreextends and forming a fuel injection nozzle, afuel injection opening in said nozzle portion, a fuel passage leading through said'valve housing to said opening, a main valve member in the valve' housing movable from closed to open position under the action of fuel pressure in said passage and provided with at least one plunger type portion with large diameter forming a fluid tight seal in said large .bore and one plunger type portion with smaller diameter forming a fluid tight seal in said small bore and a stern forming shut ofi means for controlling the passage to the nozzle opening, and an auxiliary valve in the passage assembled into the rst portion of the housing from the end face abutting the second portion and disposed at one side of the small bore in said first portion closely adjacent to said bore to utilize the space in the housing laterally of the small bore. g

, 7. A yfuel injection valve comprising a valve housing, ka rst portion of said housing provided with one bore with large diameter extending from one end of said rst portion into the housing and With one bore with smaller diameter extending from the opposite end of said first portion into the housing coaxially with said large boreand a chamber in said first portion uniting said large and small bores, a second portion of the housing formed as a piece separate from said rst portion and 'having a face abutting the end of said rst portion intok which said small ybore extends and forming a fuel injection nozzle, a fuel .in-v jection opening in said nozzle portion, a fuel passage leading through said valve housing to said V`opening and communicating at one point With said chamber, a main valve member in the valve housing movable from closed to open position under the action of fuel pressure in said passage and provided with at least one plunger type portion with large diameter forming a fluidrtight seal in said large bore and one plunger type por'- tion with smaller diameter forming a fluid tight seal in said small bore and a stern formingshut off means for controlling the passage to the nozzle opening, and an auxiliary valve in the passage between said point communicating with the chamber and the nozzle opening and assembled into the first portion of the housing from the end face abutting the second portion and disposed at one side of the small bore in said first portion closely adjacent to vsaid bore to utilize the space in the housing laterally of the small bore. HILDING GUNNAR CAMNER.

REFERENCES CITED The following references areY of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,821,272 Petersen Sept, 1, 1931 2,067,131 Schlaupitz i Jan. 5, 1937 2,380,148 Camner July 10, 1945 FOREIGN PATENTS Number Country Date i 102,718 Austria Mar. 10, 1926 

